PROJECT: Water Treatment Works (WTW) – Raithby

The existing Water Treatment Works (WTW) at Raithby had reached the end of its life and required a major refurbishment, including a new 15Ml/d iron and manganese removal system complete with disinfection and supply pumps for the production of potable water. Key features of the new works included: •Rapid gravity filters to be installed outside at high level to remove the need for an underground pump station. •Structured wall HDPE contact tanks to reduce capital costs and embodied carbon. •Standard products to maximise off-site build. •A modular approach to design to aid fabrication and construction by repetitive processes and techniques. The key processes underpinning the project were: •The selected treatment process for the scheme was a conventional iron and manganese removal plant consisting of aeration, oxidation, filtration and disinfection with a high lift pumping station. •All major items of plant were assessed to determine the use of alternative materials and potential carbon savings. •A carbon tracker was used through the process to identify where savings were achieved for each major element of plant.